Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 42 for “"Voice Over IP"”.
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Modeling and assessing secure Voice over IP performance
Voice over Internet Protocol (VoIP) systems enable efficient communications over data networks, but security of VoIP and the impact of that security on communications quality has not been quantitatively modeled. A conversational model is adapted for VoIP and a computational model of communication …
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Secure Voice over IP conferencing with decentralized group encryption
… the development of an end-to-end secure Voice over IP (VoIP) conference system. We are particularly interested in challenges associated with deploying such a system in ad-hoc networks containing low bandwidth and/or high latency data links. End-to-end security is handled by the …
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Managing uncertainty : foresight and flexibility in cryptography and voice over IP policy
… in this dissertation is under what conditions government agencies show foresight in formulating strategies for managing emerging technologies. A secondary question is when they are capable of adaptation. Conventional wisdom and most organization theory literature suggest that organizations are …
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Assessment of Voice Over IP as a solution for Voice over ADSL
Voice over DSL (VoDSL) is a technology that enables the transport of data and multiple voice calls over a single copper-pair. VoDSL employs packet voice technology instead of the traditional circuit switched voice. Voice over ATM (VoATM) and Voice over IP (VoIP) are the two main alternatives for …
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Convivo communicator : an interface-adaptive voice over IP system for poor quality networks
This thesis presents Convivo, a VoIP system designed to provide reliable voice communication for poor quality networks, especially those found in rural areas of the developing world. Convivo introduces an original approach to maintain voice communication interaction in presence of poor network …
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Design and evaluation of real-time Voice-Over-IP (VOIP) systems with high perceptual conversational quality
… focuses on the fundamental understanding of multiple quality aspects perceived and their trade-offs in the design of run-time control schemes that adapt to changing network conditions and expectations of the users of a system. One of the main contributions of this thesis is the use of adaptively …
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A hybrid and cross-protocol architecture with semantics and syntax awareness to improve intrusion detection efficiency in Voice over IP environments
Voice and data have been traditionally carried on different types of networks based on different technologies, namely, circuit switching and packet switching respectively. Convergence in networks enables carrying voice, video, and other data on the same packet-switched infrastructure, and provides …
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User generated content for IMS-based IPTV
… devices which are capable of performing multiple tasks. Due to this, services such as Voice over IP (VoIP), presence, social networks, instant messaging (IM) and Internet Protocol television (IPTV) to mention but a few, started to emerge...This thesis proposed a framework that will offer …
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Multimedia session continuity in the IP multimedia subsystem : investigation and testbed implementation
The advent of Internet Protocol (IP) based rich multimedia services and applications has seen rapid growth and adoption in recent years, with an equally increasing user base. Voice over IP (VoIP) and IP Television (IPTV) are key examples of services that are blurring the lines between traditional …
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Quality of service analysis for audio over cellular voice networks and cellular wireless wide area networks
… transfer. We believe WWANs can be availed for voice communications employing Voice Over IP technologies. Such a communication will be of better quality and offer higher resilience compared to voice communication over a cellular phone (using cellular voice networks). We present a Quality of …
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Session Management for Accountability in Distributed Multimedia Services
Internet-based multimedia applications (e.g., voice-over-IP, instant messaging, and video conferencing) are continuing to grow in importance as more people depend on such applications for personal and professional communications. Although performance is almost always a concern with multimedia …
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Wireless Network Measurement: VoIP and 802.11e.
… vital for providing interactive services such as Voice over IP. In this thesis we will review the operation of 802.11 and it’s extended MAC layer, 802.11e. We will then review some analytical models used to explore the behaviour of the 802.11 MAC and test some of the assumptions underlying these …
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A Combined WiMAX/DSRC Approach to Vehicular Networking
… applications such as streaming audio, video and Voice over IP. The thesis also describes a demonstration system that partly implements the proposed system structure.
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WhanauSIP : a secure peer-to-peer communications platform
… communications on the Internet. WhanauSIP merges a Sybil-proof distributed hash table with the session initiation protocol (SIP) to enable instant messaging, audio chat, and video conferencing that is resilient to censoring, eavesdropping, and forgery. Performance and security …
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Improving packet delivery efficiency using multi-radio diversity in wireless LANs
… applications such as games, file-sharing, voice-over-IP, and streaming video. We use the notion of path diversity to develop an approach that improves data delivery efficiency and throughput in presence of transmission errors. Path diversity relies on multiple access points (APs) covering a …
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Service Differentiation Using Managed Sleep in CSMA/CA Networks
… applications such as streaming video and voice over IP is easily degraded by a high network traffic load. Current Internet infrastructure provides no special assistance for these sensitive applications. One solution to this problem is to introduce Quality of Service (QoS) into today's most …
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Evaluating Standard and Custom Applications in IPv6 Within a Simulation Framework
Internet Protocol version 6 (IPv6) is being adopted in networks around the world as the Internet Protocol version 4 (IPv4) addressing space reaches its maximum capacity. Although there are IPv6 applications being developed, there are not many production IPv6 networks in place in which these …
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Performance Modelling and Analysis of Handover and Call Admission Control Algorithm for Next Generation Wireless Networks
… high speed data, real-time applications (e.g. Voice over IP, videoconference ) and real-time multimedia (e.g. real-time audio and video) support with a certain Quality of Service (QoS) level to mobile users. It is required that the mobile nodes have the capability of selecting services that are …
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Handling Multiple Failures in IP Networks
… to support time-sensitive applications such as Voice Over IP (VOIP), these networks need to survive failures or route changes with minimal service interruptions. For example, a disruption time of longer than 50 ms can cause calls using Voice over IP be dropped. Therefore, providing uninterrupted …
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Handoff management in the mobile wireless Internet
… handoff events. Real-time applications (e.g., Voice-Over-IP (VoIP), Video-Ondemand, and streaming) require little or no service disruptions during handoff because of their nature of being mostly delay-sensitive applications. The network must, therefore, offer minimal handoff delays, minimal …
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